Peter Cock wrote, On 04/21/2011 12:59 PM: > On Thu, Apr 21, 2011 at 5:43 PM, Assaf Gordon <gor...@cshl.edu> wrote: >> Hi Peter, >> >> Peter Cock wrote, On 04/21/2011 11:00 AM: >>> Is there any built in way to control the Unix priority level (e.g. >>> nice or ionice) used to run tasks? I don't see anything on here, >>> but perhaps I'm looking in the wrong place: >>> https://bitbucket.org/galaxy/galaxy-central/wiki/Config/WebApplicationScaling >>> >> >> I've been experimenting with 'nice' as well (for other servers), and it >> seems the consensus is that 'nice' is broken. >> >> Linus puts it in a colorful way here: https://lwn.net/Articles/418739/ >> "[...] Seriously. Nobody _ever_ does "nice make", unless they are seriously >> repressed beta-males (eg MIS people who get shouted at when they do >> system maintenance unless they hide in dark corners and don't get >> discovered). It just doesn't happen." > > I know nice isn't perfect, but in the case of the sys admin setting > up Galaxy, we don't have the human laziness problem to overcome: > We could ensure all job tasks get run with nice 10 automatically, > without the Galaxy users having to do anything special.
The article goes to explain further why "nice" is not the best option, the above quote was just a jest. But you are right that it's better than nothing. > >> One recommended solution is to use "cgroups", which can control >> CPU, Disk I/O, Memory usage and network load, as explained here: >> http://broadcast.oreilly.com/2009/06/manage-your-performance-with-cgroups-and-projects.html >> >> With "cgroups" there will be no need to change anything in galaxy >> (just apply a cgroup to the galaxy user, or something similar). > > Yes, but I want to treat the Galaxy webserver differently from > the compute jobs it launches. I'm certain there's a way to set limits per processes, not just per users - but I haven't experimented with it. > >> Unfortunately, "cgroups" requires a recent kernel, so it might not >> be applicable in your case. > > Are you using cgroups on your Galaxy? Only on my development system - unfortunately my production serve uses CentOS 5 with an old kernel and no cgroup support. -gordon ___________________________________________________________ Please keep all replies on the list by using "reply all" in your mail client. To manage your subscriptions to this and other Galaxy lists, please use the interface at: http://lists.bx.psu.edu/